Skiving machine



July 29, 1941. E. J, RAY

SKIVING MACHINE Filed April 19, 1939 5 Sheets-Sheet 1 mmm m 8w N E p La Lam 3m Em T F 5 EN vJuly 29, 1941. E. J. RAY

SKIVING MACHINE Filed April 19, 1939 5 Sheets-Sheet 2 bmw July 29, 1941. E. J. RAY

SKIVING MACHINE Filed April 19, 1939 5 Sheets-Sheet 3 ILIIIII July 29, 1941. E. J. RAY

SKIVING MACHINE Filed April 19, 1939 5 sheets..s 4

July 29, 1941. E. J, RAY 2,250,497

SKIVING MACHINE Filed April 19, 1959 5 Sheets-Sheet 5 Patented July 29, 1941 unite!) sires TENT OFFICE Shoe Machinery Corporation,

Borough of Flemington, N. J a corporation of New Jersey Application April 19, 1939, Serial No. 268,718

(Cl. Gil-9.5)

14. Claims.

This invention relates to skivingmachines and is herein illustrated as embodied in a machine having a tubular knife, said machine being particularly adapted to skive pieces of sheet material, such as leather, which are tobe incor porated inboots and shoes.

Machines of this general type have hitherto had ahollow frame of greater length-than width and having substantially upright sides and a flat horizontal top through which a portion of the knife projects. The operator sits facing one of the long sides of the frame and presents the pieces of work over a portion of the flat horizontaltop of the frame to the projecting portion of. the tubular knife. The horizontal position of the top has necessitated a somewhat tiring posture on the'part of the operator. This position has also necessitated a considerable distance from. the front wall of the frame to the adjacent edge of; the knife whereit projects above, so-that. the operator was unable to-grasp small pieces. of workand present them to the knife with his fingers close to said edge.

According, therefore, to one feature of the invention, the top of the machine slopes upward fromfront. to rear, the feed roll is yieldable about an axis which is parallel to the top, and the presser is arranged to exert its force in a direction. perpendicular to said top. With such a construction the presentation of all kinds of pieces of work. is facilitated.

In. machines of this general type it is sometimes desired to use a presser inthe form of a presser foot or an idle presser roll which requires no driving mechanism, while at other times it isdesired to use a driven presser roll; and commonly a. machine having ahead fitted with a presser foot. or an idle presser roll has been used in one case and another machine fitted with a driven presser roll in the other. According to afurther feature of. the present invention, the hollow frame has an opening in its top over which a head may. be detachably fastened, the head which carries a driven presser roll having aportion which extends down through said opening and being provided with mechanism for driving the presser roll from. a moving part located inside the frame of the machine. With such a construction it is necessary. merely to change heads whenit is desired to change from a presser' whichis driven to one which is not, or vice versa.

These-and other features of the invention, including certain details of construction and combinations of parts, will be set forth as embodied in an illustrated machine and pointed out in the appended claims.

Referring to the accompanying drawings,

Fig. 1 is a front view, principally in elevation, of a machine in which the present invention is embodied, part of the wall of the frame having been broken away to expose certain other parts which'a're shown in section; V

Fig. l is a detaiLprin'cipally in section-showing more particularly part of the mechanism for rotating the presser 'roll; 7 I

Fig. 2 is a view, partly in plan'and partly in section, of the parts of the'machine which are located beneath the top of the frame;

Fig. 3 is an end view of the machine, partly in section and partly in elevation;

Fig. 4 is a detail in section showing the feed roll and part of the mechanism for driving it;

Fig. 5 is afview looking down upon a part of the machine from which the head has been removed;

Fig. 6 is a view, partly in section and partly in elevation, of the knife, the feed roll' and their mountings;

Fig. '7 is a detail, principally in plan view, of the grinder and a part of the knife;

Fig. 8 is a longitudinal section through the hub of the member'which carries the grinder; and

Fig. 9 is a detail in elevation of a part of the mechanism for rotating the shaft from which the feed roll is driven.

Referring first to Figs. 1, 2 and 6, the mounting of the tubular knife I! will be described. The

= knife shaft l5 (Fig. 6) has at its inner end aflange, and projecting from the middle of the flange a cylindrical extension which fits into a bore in the center of the rear wall of the knife I1, the knife being fastened to the flange by screws H! which pass through holes in the rear wall of the knife and are threaded into ears on the flange. The knife shaft is mounted'in and adjustable with a horizontally adjustable, cylindrical carrier 2|, said knife shaft being rotatably mounted in two ball thrust bearings 23' (Figs. 1 and 6), said bearings being mounted in the cylindrical carrier 2'! and spaced apart by a sleeve 25. The bearings are held respectively from movement away from the ends of the sleeve by a shoulder on the forward end of the shaft 15 and by a cap 126 which is threaded ona portion of reduced diameter at the rear end of the shaft. A collar 21 (Fig. 1),which is fastened to the rear end of the cylindrical carrier 21, engages the right-hand face of the outer ring of the rear ball bearing 23; and a spring-pressed collar 29 (Fig. 6) engages the left-hand face of the outer ring of the forward ball bearing 23, said collar being acted upon by springs carried in sockets formed in a collar 3|, which is fastened by screws to the forward end of the cylindrical carrier 2|. These ball bearings are of the type known as radial thrust bearings and the details of their construction form no part of the present invention.

The cap 26, which is threaded upon the rear end of the shaft I5, has an enlarged head provided with two diametrically opposite slots to receive driving pins 35 carried by a pulley 31, which is keyed to the forward end of a short driving shaft 39, said shaft being mounted in ball bearings 4| and having keyed to its rear end three pulleys 43, 45, 41, which are integral with one another. A belt 49, driven from any suitable source of power, runs around the pulley 41. The pulleys 43, 45, as will presently be explained, are part of a change speed mechanism for rotating the feed roll of the machine, and the pulley 31 serves, through suitable connections, to rotate the grinder. The cylindrical knife shaft carrier 2| is mounted for longitudinal sliding movement in a split bearing in the frame of the machine and is held in adjusted longitudinal position by a pinch bolt 5| (Fig. 2) having a nut 53 threaded on one end. Rotatably mounted on the pinch bolt is a sleeve 55, having at its outer end a head by which it may readily be turned and having at its inner end a pinion 51 which meshes with a rack 59 formed on the underside of the cylindrical carrier 2|. After the pinch bolt has been loosened, the sleeve 55 may be turned to adjust the whole knife assembly, including the cylindrical carrier 2| with its ball bearings, the knife I 1 and the knife shaft I5, the slots in the head of the cap 26 permitting such adjustment while maintaining the driving connection between the cap and the pins 35.

The knife (Fig. 6) is provided with a saucershaped chip deflector 6| fastened to a flange at the outer end of a hollow stem 63, the inner reduced end of which is threaded into the knife shaft I5. A locking screw 65, threaded into the hollow stem 63 and adapted at its inner end to contact with the bottom of the socket into which the stem 63 is threaded, furnishes means for looking the chip deflector in adjusted longitudinal position. This construction provides for adjustment of the chip deflector longitudinally of the knife to compensate for shortening of the knife due to its being ground.

A grinder 61 (Figs. 3 and 7) of the annular type is so mounted that the plane of its operative face is at an angle of about to the axis of the knife shaft I5, the construction being such that as the knife I1 is ground away the angle of the bevel of the knife is maintained always the same. To this end, the grinder is mounted in a head 69 fast to the inner end of a shaft 1|,

- which is rotatably mounted in ball bearings carried by a casing 13, said shaft having fast to it a spiral gear 15. The casing 13 has integral with and at an angle to it a long hub rotatable about the axis of a shaft 85 which is parallel to the knife shaft I5, said shaft 85 having a spiral gear 81 in mesh with the spiral gear 15 on the grinder shaft. The hub of the casing 13 has fastened to it by set screws 88 two spaced alined sleeves 89, 9!, which are rotatable, respectively, in bearings 93, 95 carried by a plate 91, which is fastened by screws 99 to the frame of the machine. In the space between these two sleeves, the shaft 85 is of reduced diameter and on it is pinned the spiral gear 81. This shaft extends through a bore in the sleeve 9|, and its reduced and extends into a bore in the sleeve 89. Near its right-hand end, the sleeve 9| has a downwardly extending, bifurcated arm having alined bores in which is rotatably mounted a pin IIJI through which is threaded the end of an adjusting rod IE3. This rod (Fig. 2) extends out through the front wall of the frame of the machine and has attached to its outer end a hand wheel I 95, by which it may be turned. Inside the wall of the frame, the rod I93 has formed upon it a ball I91 which is held in a hemispherical socket in a boss formed on the wall. The ball is maintained at all times pressed into the hemispherical socket by a tension spring I99 fastened at its upper end to the top wall of the frame and at its lower end to a pin I II on a generally horizontal arm which projects from the right-hand end of the sleeve 9|. With this construction, when the adjusting rod I03 is turned, the grinder is swung into or out of contact with the knife about the axis of the shaft 85, that is, about an axis which is parallel to the axis of rotation of the knife. Since the knife is adjusted for wear by turning the sleeve 55 (Fig. 2), as has been explained above, its edge is maintained in the vertical plane shown, and consequently the angle or bevel of the edge of the knife is always the same. The grinder driving shaft 85 (Fig. 2) extends well to the right-hand end of the machine, passes through a bearing H3 and has fast to it a pulley II5, around which and around the pulley 31 on the knife shaft passes a belt 1. A belt shifter II9 provides means for shifting the belt to a groove I in a stationary member when desired, the belt shifting mechanism being preferably of the kind disclosed in United States Letters Patent No. 2,021,964, granted November 26, 1935, upon an application filed in my name.

As is common in skiving machines of this general type, the feed roll is mounted in an auxiliary part |2I of the frame (Fig. 2), which is pivoted about the axis of a vertical pin I23 to the main part I25 of the frame; and the main part is pivoted about a horizontal rod I26 carried by ears formed on the base I28. The auxiliary part is held in the closed position shown by a lock which may be rendered operative or inoperative by turning a handle I21. The feed roll I29 is driven from a short horizontal shaft |3I mounted in bearings in the auxiliary part of the frame and having near its outer end, a ball thrust bearing I33, a cover I34 being provided for the recess in which the bearing is located. The other end of the shaft |3| is enlarged and provided with radial teeth I35 which, when the auxiliary part of the frame is in closed position as shown, engage similar teeth on the adjacent enlarged end of an alined shaft I31 mounted in bearings carried by the main part of the frame. The short shaft I3I carries a worm I39 (see also Fig. 4), which meshes with a worm gear |4I fast to one end of a short shaft I43, said shaft extending through a bearing sleeve carried by the auxiliary part of the frame and having a nut I threaded on its outer end. The worm gear MI is located in the base of a cylindrical socket formed in the auxiliary part of the frame; and in the open end of the socket is fitted a thick washer I41, which is held in place by a set screw (not shown). The inner end of the shaft I43 is of enlarged diameter and is provided with a socket and slots to receive a ball azsaeev.

and a pin at" one end. ofa short. linki M9,.v the, other end of which: is. similarly connected to one end of the-feedroll: I29. These-two: universal joints permit the feed roll:=to;yield-.in a manner presently to be described, while maintaining. the

driving; connections betweenthe shaft. 8- and v the roll;

The main part I25 of the frame is in thesglerreral shape of a rectangular box, except that. it has? no bottom wall: and no: end: walladjacent to the auxiliary part. I2 I=. When the main .part. of the frame and. the auxiliary part. are, asshown; inthe positionwhich they occupy-when themachine is beingoperated thetops and sides of the two parts are; flush: with each; other. It. will: be noted, as best: shown in Fig. tha-tthe top; of the part I2I of the frame'includesathroat plate I55, the" upper surface of WhiChiiSiflLlShWiflI. the upper. surface: of thetop--of: said-part. and forms part. of saidtop: The operator,. who. is seated. in front of the: machine, that. is-,- in approximately theposition. of:v theobserver iirFi'gj. I, presents the pieces. of worlc from left to right over" the top'of the auxiliary part of the f-rametotherfeed rolland knife.

Machines: of. the general type: under discussion have been made: in: two forms (1) with a' frame comprising: a main part. and; a. swingingjpariras in the illustrated machine; and: (2)- with. a. one;- piece frame. Inasmuch as; bothtypes? of. frame are substantially alike when the: swinging; part of type No. 1 isin' closed operating position, the word frame in the" following: explanation: of one featurerofthe presentmachine willlbe used asinclusive of the: whole: frame. in: the: position it occupies whenthe machine is running: Hitherto; in machines-of. this type,..the frontwall; the right-handwall' as viewedin Fig. 3; hasgbeensubstantially vertical except for a rather abrupt curve at its. top, and. the top of the frame: has been horizontal. With suclra construction, particularly if a knife of: comparatively large'diam'eter is used, a considerable extent of'thehorizontal' surface of the top of the" frame separates the top: of the front. wall from: that. locality on the'tubular-knife adjacent IIOIThBT wall which projects above said surface. That is, there has'been a considerable distance between: the localities which correspondlto' the loicalitiesx andiy: (Fig. 3') of the-present machine... The: operator, as has been explainedsits atthe: right of the machine, as viewed in Fig. 35, withhis left sidetoward the observer and" presents pieces of work from left to right over'the toprof' the frame to-the knife andfeed' roll: The-horizontal'position. of the top of the frame has necessitated; a; somewhat; tiring posture on the part: of. the operator, who is obliged to lean over more or less toward themachine ashe presents piecesofiwork to it; and the distance between the top. of the front'wall and the adjacent portion of the-exposed edge of the knife has interfered with the presentation of small pieces of: work, since the operator has been unable to graspsuch small pieces of work close to" the locality on the knife which was: to operateupon them; In order to: remedy these defects, the greater part of the front wall of the present machine is'curved toward the-knife, and the top wall, instead of being horizontal, is inclined upwardly away from the front of the machine, that is, away from the operator, theaxis of the feed roll when no work. is'inithemachinebeing inclined. ina. direction parallel to that of the top. With: such a construction inwhich the top of the frame is inclinedupwardly away from the operaton, the; presentation of all kinds. (if-work is greatlyfacilitated; and. a tubular knife-haying a. considerable diameter; for example: six inches. or more, may beused'jwhilesstillimaintaining the distancetfromthe-top of the front walLto theadjjacent. exposed: edge of the; knife. very small:

Thefeed roll carrier (Fig. 3)' is in theifomniof a yoke I51, the ends of the arms of which arerotatably-mounted. on a rod I59 having anaenlarged portion at its outer endwhich: is; threaded through a: bore in theswinging part I2I of? the frame and is. held, in adjusted. position. byv a lock nut. I5:I-.. Theyoke. isheld: from: longitudinal movement on therod by a collar: I53: and a shoul den on. the. red I 59, said; rod; being. of. reduced diameter where it passes'throughrtheends. of the arms of? thegyokez The-yoke. I51 (Fig.6): has a downwardly extending arm. I61 provided. witha small pin Ia69; the; head of which is in contact at all. times: with: a' spring-pressed plunger I111 slidably mounted in; a bore-ina' hollow screw I13, which is threadedithrouglr a boss:on one wall. of the swinging part I=2:I= of, the frame. By turning the screw I 13;. the tension; of; the: spring I15". may be varied; Driven into thepopposit'e side of the downwardly extending: arm I61: of the yoke. I51. below the; pin. I619 is. a. secondapin'. I511; which is heldf'by the action of the COmDI'GSSiOIILSPIfiIIg I15 against a. stop: in the. formof' an eccentric. pin I on the inner end; of asmallangularly adjustable shaft I=8I-; the outer: end? of which projects through the rear wall: of the swinging part I-2=I of the frame (Fig; 3.) and has a pin t83 extending throughv it to. serve asahandleby whichit may be-turned; Aset screw I85, threaded through a wall: of the swinging part I2=I of the frame into contact with; the adjustable shaft I BI, holds said shaft in; adjusted angular position; With the construction thus far described, the compression spring I15 normally holds the roll carrying yoke I51. and. the feed roll I29 in the position shown, but permits the'yoke and rollto yield about; the axis of' the rod I59, thus providing for bodily. yielding movement of the feed roll.

The feed roll is: also mounted for angular or tipping movement about an inclinedaxi's, which passes through a point 2 (Fig. 4) at the outer upper corner of the roll; The rollisrotatably mounted upon the stemof a screw I81, theliead of which is seated in a socket in one end" of the roll, the other end of the-screw being threaded intov a. split: portion of: a block I89-iand held firmly by a pinch bolt I9'I, a washer I92 being interposed between-the end of the roll and the-bl'ock. The block I895 (Figs, 2: and 6) has integral with it a. cylindrical stem I93 rotatably mounted in a bore in a boss on one arm-ofthe yoke I51; The bore isinclin-ed upwardly from left to right, as viewed in Fig. 6-, and its axis passes through the point. 2- (Fig. 4). A small screw I94 (Fig; 6); threaded into one end of the stem I93 and'car'rying a washer I95 holds the stem I93 in the inclinedbore. The roll I ZQ -is normally held in the angular position shown, with reference to the axis which passes through the point 2, by a torsion spring I95 which is wound about a small rod I91, one end of the spring being fast to-a collar I99 which is pinned to the rod. The. other end of the spring extends beneath and exertsupward pressure upon.- the underside of a small screw 2M threadedinto a bracket 389' which is fastened to the block. 189' by screws I; The torsion-- spring atall times urges the roll upwardly about the axis of the stem- I93 as faras a stop: 291 carried by the yoke I 51 will. permit. The r [97: g

3), which carries the torsion spring I95 and has a hexagon head, passes through a split bearing in the yoke I51 and is held in adjusted angular position by a pinch bolt 209. The feed roll I29 (Figs. 4 and 6) is slotted circumferentially, and a comb 2II has teeth extending into the slots, said comb being fastened by screws M3 to the block I89.

' Referring now to Fig. 2, it has been explained that the feed roll is driven from a horizontal shaft I31, which is mounted in hearings in the main part I25 of the frame. This shaft is urged at all times to move to the left by a compression spring 2I1 located between a part of the main frame and a collar 2I9, which is fast to the shaft I31, the extent of such movement being limited by contact with one of the bearings for the shaft of the hub of an internal gear 2I5, which is fast to one end of the shaft. Meshing with this in ternal gear is a pinion 22I fast at one end of a short shaft 223 having fast to its outer end two pulleys 225, 221, which are formed on a common hub. A belt 229 may be caused to run over the pulleys 43 and 225, as shown, or over the pulleys 45 and 221, according to what speed of rotation is to be imparted to the shaft 223. In order to provide means for tightening the belt 229, the short shaft 223, which carries the pinion 22I, is mounted out of line with the shaft I31 in a bearing having integral with it a circular flange 23!, which is rotatable in a circular aperture in a wall of the frame, said aperture and said circular flange being coaxial with the shaft I31. Integral with the circular flange 23I is a flange 233 of larger diameter, the rim of which is clamped against the frame of the machine by cap screws 235, the stems of which are threaded into the frame and the heads of which overlap the flange 233. After the cap screws have been loosened, the bearing, in which the short shaft 223 is mounted, may be turned to vary the distance of the pulleys 225, 221 from the pulleys 43, 45, while maintaining the pinion 22I in mesh with the internal gear 2! 5. In order to facilitate turning this bearing, its hub is provided withrectangular recesses 231 to receive a screw-driver or other tool.

The work is held against the feed roll I29 by a presser which may be in the form of a driven presser roll, as herein shown, or in the form of a presser foot or an idle presser roll, said presser being carried by the overhanging arm of a hollow head 239. The present machine is provided with two of these heads, one carrying a driven presser roll and the other carrying either a presser foot or an idle presser roll, said heads being readily removable and replaceable. The illustrated machine is shown with the head which carries the driven presser roll. The hollow head comprises a base (Fig. 3), which is fastened by cap screws 2M to the top of the main part of the frame over an opening in said top. At the outer end of the overhanging arm of the head a stem 243, rectangular in cross-section, is mounted for sliding movement in a path which is perpendicular to the inclined plane of the top of the frame, said stem being urged upwardly by a compression spring 245 as far as an adjustable screw 291 will permit. The stem has at its upper end a cylindrical transverse portion (not shown) about which it may be swung to some extent toward and from the observer. An adjusting screw 249 engages one face of the stem, and a similar screw (not shown) engages the other face, the two screws determining the angular position of the stem. The mounting of the stem 243 for sliding vertical adjustment and for swinging adjustment toward and from the observer, as viewed in Fig. 3, form no part of the present invention and may be the same as that disclosed in United States Letters Patent No. 1,469,849, granted October 9, 1923, upon an application filed in my name.

At the lower end of the stem 243 is a transversely extending slotted head 25I, in which is received the upper part of a presser roll carrier 253, which is pivoted to the transverse head 25I about the stem of a pin 255. A leaf spring 251, one end of which is fastened to the head 25I and the other end of which bears upon a tail on the presser roll carrier 253, holds said carrier in an angular position determined by an adjusting screw 259, which is threaded through the head and contacts with the roll carrier, a coiled spring 25I preventing the screw 259 from accidental turning. The presser roll 263 is fast to a small spindle 255, which has at its rear end an enlarged portion. Between this enlarged portion and the larger end of the roll is a bushing 261, a portion of reduced diameter of which is clamped by a pinch screw 210 in a pinch bearing formed in a downwardly projecting portion of the carrier 253. The outer end of the small shaft 265 is rotatably mounted in a bearing in a second downwardly projecting portion of the carrier. The presser roll is rotated through a small shaft 21I, which is connected at one end to the enlarged end of the shaft 265 by a universal joint and at the other end by a second universal joint to one end of a short shaft 213 rotatably mounted in bearingsin the hollow head 239. This shaft carries a spiral gear 215, which meshes with a second spiral gear 211 on a horizontal shaft 219 mounted in the head. Also on the horizontal shaft behind the gear 211, as viewed in Fig. 3, is a spiral gear 28I (Fig. l) which meshes with a spiral gear 283 on an inclined shaft 285, said shaft having an oiler 281 at its upper end. The shaft 285 (Fig. 1 is rotatable in a bushing 288, the reduced upper portion of which is driven into a bore in the lower portion of the hollow head 239. said shaft having at its lower end a spiral gear 289. The lower portion of the shaft 285 and of the bushing 288 extend down through the opening in the top of the main frame, and the spiral gear 289 meshes with a spiral gear 29I (Fig. 2) on the shaft E31, through which the feed roll is driven. With this construction, the head with the driven presser roll carried by it may readily be removed and replaced, either by another head having a differently shaped driven presser roll, or by a head having a presser foot or an idle presser roll.

There is a space (Fig. 6) between the rear wall of the tubular knife and the edge of the top of the frame so as to provide for longitudinal adjustment of the knife; and in order to prevent chips and other foreign matter from falling into this space, there is provided (see also Fig. 5) a cover plate 293, the forward end of which bridges this space. This plate is fiat on its under side and is provided with a rib which enters a longitudinal guideway formed in the top of the frame so as to permit the plate to be adjusted The plate has fastened to it by a screw 295 the upper end of a pin 291, the lower end of which extends loosely into a socket in the cap 3I, said cap, it will be recalled, being fast to the cylindrical carrier 2I of the knife shaft. Consequently, when this carrier is adjusted to adjust the knife,

the cover plate 293'is also adjusted, its position. with respect to the knife remaining unchanged with the result that the space between the rear wall of the knife and the adjacent edge of the top of the frame is always covered by the plate. This construction also permits the cover plate to be removed at any time merely by lifting it up.

Although the invention has been set forth as embodied in a particular machine, it should be understood that the invention is not limited in the scope of its application to the particular machine which has been shown and described.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A skiving machine having in combination a rotary tubular knife, a feed roll located partly within the knife, a presser which cooperates with the feed roll, said knife having an outside bevel along its cutting edge and being adjustable longitudinally, and a rotary grinder having an operative face which is all in one plane, said grinder being angularly movable into and out of operative position about an axis which is parallel to the axis of rotation of the knife.

2. A skiving machine having in combination a rotary tubular knife, a feed roll located partly within the knife, a presser which cooperates with the feed roll, said knife having an outside bevel along its edge and being longitudinally adjustable, a rotary shaft parallel to the axis of rotation of the tubular knife, a casing rotatable about the axis of said shaft, a short shaft mounted for rotation in the casing, said shaft being at an oblique angle to the first-named shaft, gears connecting the two shafts, a grinder carrier by the short shaft, and means for swinging the grinder into and out of contact with the bevel along the edge of the tubular knife.

3. A skiving machine having in combination a rotary tubular knife, a feed roll located partly within the knife, a presser which cooperates with said feed roll, said knife having an outside bevel along its cutting edge and being adjustable longitudinally, a rotary grinder angularly movable into and out of operative position about an axis which is parallel to the axis of rotation of the knife, and means for so moving the grinder, said means including a spring constantly urging the grinder to move in one direction and an adjusting rod rotation of which moves the grinder in the opposite direction, said rod carrying a ball which is held by the force of the spring against a spherical socket in the frame of the machine.

4. A skiving machine having in combination a rotary tubular knife, a work support above the surface of which the knife projects, a feed roll located partly within the knife, a presser which cooperates with the feed roll, a shaft from which the feed roll is driven, a gear fast to said shaft, a driven pulley rotatable about an axis which is eccentric to the axis of said shaft, a belt for driving said pulley, and a pinion rigid with the pulley and meshing with the gear, said pulley and pinion being adjustable in a circular path about the axis of said shaft.

5. A skiving machine having in combination a rotary tubular knife, a feed roll located partly within the knife, a presser cooperating with the feed roll, a block by which the roll is carried, said block having a stem the axis of which passes substantially through the upper outer corner of the roll, a yoke in which said stem is mounted for rotation, a stop mounted on the yoke for limiting the extent of the rotation of the block, a torsion spring one end of which engages the underside of the block and normally holds it against. the stop,za rod about which a portion of the spring is wound and to which one end is fast, a split bearing formed in the yoke through which the rod passes, and a pinch screw for clamping the rod in adjusted angular position.

6. A skiving machine having in combination a rotary tubular knife, a feed roll located partly within the knife, a presser cooperating with the feed roll, a block by which the feed roll is carried, said block having a stem the axis of which passes through the upper outer corner ofthe feed roll, a rotatable yoke in which said stem is rotatably. mounted, said yoke having a stop tol-i-mit theextentv of rotation of the block, a torsion spring carried by the yoke and normally holding the block against the stop, a compression spring for rotating the yoke, and a'stop for limiting the extent of such rotation.

7. A skiving machine having in combination a hollow frame having an opening in its top, a rotary tubular knife, a. feedroll located partly within. the knife, a driving member located in 4 r the frame beneath said opening, a head detachably fastened to said top and having a portion extending into said opening, a presser roll carried by the head, and mechanism carried by the detachable head for connecting the presser roll with the driving member.

8. A skiving machine having in combination a hollow frame having an opening in its top, a rotary tubular knife, a feed roll located partly within the knife, a driving member located in the frame beneath said opening, a hollow head detachably fastened to said topand having a portion extending into said opening, a presser roll carried by the head, and mechanism including gearing located within said hollow head for connecting the presser roll with the driving members.

9. A skiving machine having in combination a frame having an opening in its top, a rotary tubular knife, a feed roll located partly within the knife, a head detachably mounted upon the top of the frame and having an extension which projects down through an opening in the top, a presser roll carried by the head, and mechanism including a gear carried by the downwardly projecting portion of the detachable head for rotating the presser roll.

10. A skiving machine having in combination a frame having an opening in its top, a rotary tubular knife, a feed roll located partly within the knife, a head detachably mounted upon the top of the frame and having an extension which projects down through an opening in the top, a presser roll carried by the head, a gear located in the frame beneath the opening in the top thereof, and mechanism carried by the detachable head and including a gear supported by the downwardly projecting portion of the head and adapted to mesh with said first-named gear for rotating the feed roll.

11. A skiving machine having in combination a tubular knife, a shaft by which the knife is carried, a feed roll located partly within the knife, a presser cooperating with the feed roll, a chip deflector located within the knife and having a stem threaded into a socket in the end of the knife shaft whereby the chip defiector may be adjusted longitudinally of the knife, and a screw threaded into a hollow in said stem and engaging the bottom of the socket in the end of the knife shaft.

12. A skiving machine having in combination a hollow frame a portion of which serves as a work support, said frame being higher at the back than at the front so that the top is inclined from rear to front, a rod parallel to the inclined top of the frame, said rod being threaded through the back wall of the frame so as to be adjustable lengthwise, a feed roll carrier pivoted on the rod for yielding movement in a path at right angles to the rod, a feed roll pivoted to the carrier for yielding movement in a path parallel to the rod, a tubular knife partly enclosing the feed roll, and a rotary shaft on which the knife is mounted.

13. A skiving machine having in combination a hollow frame a portion of the top of which serves as a work support, said frame being higher at the back than at the front so that the top is inclined from rear to front and the space in the rear part of the frame is larger than that in the front part, a rod parallel to the inclined top of the frame, said rocl being threaded through the back wall of the frame so as to be adjustable lengthwise, a feed r011 carrier in the form of a yoke pivoted on the rod for yielding movement in a path at right angles to the rod, a feed roll pivoted to the yoke for yielding movement in a path parallel to the rod, a tubular knife partly enclosing the feed roll, a rotary shaft on which the knife is mounted, means located in the rear part of the frame for adjusting the yoke about the rod, a shaft located in the rear part of the frame below the level of the knife shaft, and a grinder adjustable about the axis of the shaft.

14. A skiving machine having in combination a tubular knife, a rotary shaft on one end of which the knife is mounted, ball bearings in which said shaft is rotatable, a cylindrical carrier for said ball bearings, a spacing sleeve surrounding the shaft and in contact at one end with one ball bearing and at the other end with the other ball bearing, a member threaded upon the shaft and adapted to exert force through one ball bearing and the sleeve to hold the other ball bearing against a shoulder on the shaft, and means for adjusting the carrier longitudinally and with it the shaft and the ball bearings.

EUGENE J. RAY.

CERTIFICATE OF CORRECTION. Patent No. 5 L97- July 29, l9lil.

I EUGENE J. BAY.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, first column, line 56, claim 2, for theword "carrier" read -carried-; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25rd day of September, A. D. 1914.1.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents. 

